(57) Apparatus for providing a signal representative of armature displacement in a magnetic
bearing assembly for a magnetic suspension system, of the type having a force sensor
(34, 36) applied in a closed loop to provide a linear response with respect to an
input force command signal. Signals representative of currents (I,, 12) applied to the magnetising coils (22,24;26,28) and of the sensed force are used
to derive the armature displacement signal. The signal so derived is applied to modulate
the magnetic flux and obviates the need for proximity devices for sensing armature
displacement. A circuit (88) for generating the armature displacement signal is provided.
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